Granted Patent
Utility
US 4,938,166 · App. 07/156,252
Device for growing multi-layer crystals employing set of masking elements with different aperature configurations
Inventor:
Robert L. Joyce
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Feb 16, 1988
Inventor
Robert L. Joyce
Assignee (at issue)
Hughes Aircraft Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.